Abstract
We demonstrate that the recent measurement of the cross section line shapes of e+e−→χc0ω can be naturally explained by the molecular picture for Y(4260) where the Y(4260) is treated as a hadronic molecule dominated by D¯D1(2420)+c.c. This result is consistent with properties extracted for Y(4260) as the D¯D1(2420)+c.c. molecular state in other reactions such as e+e−→J/ψππ, hcππ, D¯D⁎π+c.c., and γX(3872).
Highlights
Ever since its discovery in 2005 by BABAR Collaboration [1] the true nature of Y (4260) has attracted a lot of attention from the hadron physics community
In Refs. [12,13,14] the coupled-channel effects in the charmonium spectrum were proposed as an explanation for the observed peaks that cannot be assigned to conventional charmonia
Among these molecular solutions it is difficult to accommodate the J/ψKKpicture within the updated experimental measurements in various processes, while D D1(2420) + c.c. and χc0ω bound state interpretations are attractive to be confronted by experimental data for both hidden charm decay channels, i.e. e+e− → J/ψππ, hcππ, χc0ω, or open charm decays into DD ∗π + c.c
Summary
Ever since its discovery in 2005 by BABAR Collaboration [1] the true nature of Y (4260) has attracted a lot of attention from the hadron physics community. There are no obvious peak structures around the Y (4260) mass region in e+e− annihilations into open charm final states Following these observations there have been various theoretical interpretations for the nature of Y (4260) in the literature. Due to the dynamics involved in the open threshold regime, a clear, Breit-Wigner-like cross section line shape is not expected This phenomenon is taken as a support of the hadronic molecule scenario [24, 25] and turns out to be coincide with the experimental measurement of Belle [27]. Faccini et al [31] interpret the structure in the χc0ω channel using Breit-Wigner functions and masses for a tetraquark state determined in Ref.
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